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Abstract “Thanks to Allah who guided us to this since we would have never been guided without his guidance” I would like to thank Prof. Adel D. Shaltout for giving me the chance to work with him as I have always hoped and gratefully acknowledge the enlightening conversations with him which has helped me in understanding many of the complex issues I had faced. I would like to express my deepest gratitude and thankfulness to Dr. Amr Abdel-Allah Emam for suggesting this line of research, for his kind supervision, for his advice, valuable comments and encouragement throughout this thesis. It is my pleasure and gratitude to work with such a great person who guided me not only on that thesis but also on many fields in a real life. I would like to thank Dr. Hanafy Hassan, faculty of engineering Cairo University for his valuable support and advice. Many thanks also to all my friends and my colleagues at Fayoum University for their support and encouragement. It is also my pleasure to thank my family for their tolerance, support and encouragement. |